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function maybePrint(x?: string) {
  if (x != null) {
    // we know that x will be a string in this scope
    console.log(x);
  }
}

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interface Named {
   name: string;
}

let x: Named;
let y = { name: "John", age: 42 };

// This is OK because Y meets the interface requirements of Named
x = y;

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# ...
expectation_mutex = Mutex.new

expect(client).to receive(:fetch_users) do |args|
  expectation_mutex.synchronize do
    expect(args).to eql(current_page)
  end

  # ...
end

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it 'makes two requests to resolve the users when necessary' do
  current_page = 1

  expectation_mutex = Mutex.new

  expect(client).to receive(:fetch_users).exactly(2).times do |args|
    expect(args).to eql(current_page)

    current_page += 1

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it 'makes two requests to resolve the users when necessary' do
  current_page = 1

  expectation_mutex = Mutex.new

  expect(client).to receive(:fetch_users).exactly(2).times do |args|
    expect(args).to eql(current_page)

    current_page += 1

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class SomeAPI
  def fetch_users
    prom = if only_need_to_fetch_one_page?
             client.fetch_page(1).then { |res| res.fetch('users') }
           else
             promises = Concurrent::Promise.zip(client.fetch_page(1), client.fetch_page(2))

             promises.then do |first_page, second_page|
               combine_results(first_page, second_page)
             end

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class ThreadsafeMemoized
  def initialize
    @memoized = {}
    @mutex = Support::ReentrantMutex.new
  end

  def fetch_or_store(key)
    @memoized.fetch(key) do # only first access pays for synchronization
      @mutex.synchronize do
        @memoized.fetch(key) { @memoized[key] = yield }

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# frozen_string_literal: true

require 'aws-sdk'

# This will create an engine mounted at your subdomain of choice. 
# If you wanted it to be `kibana.example.com`, set KIBANA_SUBDOMAIN="kibana".
# The engine can be routed in Rails like so:

# Rails.application.routes.draw do
#   constraints subdomain: ENV.fetch('KIBANA_SUBDOMAIN') do

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# frozen_string_literal: true
begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required.'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'

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require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"
  gem "activerecord", "5.0.0"
  gem "sqlite3"
end

require "active_record"
require "minitest/autorun"